package com.ztest.chapter32;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * \* Created with IntelliJ IDEA.
 * \* @author: 11568
 * \* @date: 2019/09/02
 * \* Time: 15:06
 * \* 码云: https://gitee.com/SXQZ/springboot
 * \* To change this template use File | Settings | File Templates.
 * \* Description:chapter 32 获取SpringBoot项目的applicationContext对象
 * \
 */
@Component
public class ApplicationContextProvider implements ApplicationContextAware {

    /**
     * 上下文对象实例
     */
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    /**
     * 获取applicationContext
     * @return
     */
    public ApplicationContext getApplicationContext(){
        return applicationContext;
    }

    /**
     * 通过class获取Bean
     * @param clazz
     * @param <T>
     * @return
     */
    public <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name获取Bean
     * @param name
     * @return
     */
    public Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name,clazz);
    }
}
